A DIY project that could transform solar power

A do-it-yourself device that started life as a hobby and took off during COVID-19 could help to unlock the next generation of solar energy, including advanced technology for space missions.

Dr Jamie Laird, a Research Fellow at the ARC Centre of Excellence in Exciton Science and the University of Melbourne, has invented a new machine for testing the defects in perovskite solar cells, the first of its kind anywhere in the world.

Perovskite solar cells can match silicon for efficiency, are cheaper to manufacture and more flexible, but they haven’t become commercially viable yet, because they’re still too unstable when exposed to heat, light, moisture and oxygen.

That’s where Jamie’s device comes in. A combination of a microscope and a special laser, it produces pictures and maps of the defects within solar cells and tells scientists where the cells are losing power or efficiency over time and use. It also provides data to indicate why.

An example of micro-spectroscopy, the innovative technique started life as a personal project for Jamie, and was originally intended to analyse minerals.

When he joined Exciton Science, Jamie realised his gadget would be a perfect tool to help colleagues – and other leading solar cell researchers around the world – to better understand the frustrating issues that have kept perovskites from fulfilling their exciting promise.

“The basis of the technique is microscopy but merging it with frequency analysis,” Jamie said.

“We use a laser beam and we focus to a spot and scan across the device to measure the quality of the solar cell.

“This new method allows us to do imaging analysis of whole or complete solar cells and look at how they perform, how they change with time and aging, and how good a solar cell they are.”

In addition to partners at Monash University, a team from Oxford University is already sending samples of cutting-edge prototypes to be tested by Jamie’s homemade machine.

And members of the University of Sydney working on experimental solar cells for satellites and other space vehicles are also on the waiting list to collaborate.

“You can’t have a solar cell that decomposes quickly when it’s meant to last 20 years in the field,” Jamie said.

“This is a missing link in the repertoire of techniques we have to throw at that problem.”

Research Report:Intensity Modulated Photocurrent Microspectrosopy for Next Generation Photovoltaics

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